3780784720 has 20 divisors (see below), whose sum is σ = 8790324660. Its totient is φ = 1512313856.

The previous prime is 3780784691. The next prime is 3780784729. The reversal of 3780784720 is 274870873.

It can be written as a sum of positive squares in 2 ways, for example, as 1225280016 + 2555504704 = 35004^2 + 50552^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3780784729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23629825 + ... + 23629984.

It is an arithmetic number, because the mean of its divisors is an integer number (439516233).

Almost surely, 2^3780784720 is an apocalyptic number.

It is an amenable number.

3780784720 is an abundant number, since it is smaller than the sum of its proper divisors (5009539940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3780784720 is a wasteful number, since it uses less digits than its factorization.

3780784720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47259822 (or 47259816 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 46.

The square root of 3780784720 is about 61488.0860004603. The cubic root of 3780784720 is about 1557.8560181755.

The spelling of 3780784720 in words is "three billion, seven hundred eighty million, seven hundred eighty-four thousand, seven hundred twenty".